Milling-machine



W. D. CRAFT AND F. F. SORENSEN.

MILLING MACHINE.

APPLICATION FILED AUG.I8, 1919.

1,356,807. Patented 0.... 26,1920.

4 SHEETS-SHEET I.

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W. D. CRAFT AND F. F..SORENSEN.

MILLING MACHINE. I

APPLICATION F|LED AuG.1s,1919.

1,356,807. Patented oct. 26,1920.

4 SHEETS-SHEET 2.

I 2 Tl I f 11. I l I l" I O a Q I? W. D. CRAFT AND F. F. SORENSEN.

MILLING MACHINE.

APPLICATloN FILED AuG.18,1919.

Patented Oct. 26, 1920.

4 SHEETS-SHEET 3.

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W'. D. CRAFT AND F. F. SORENSEN.

MILLING MACHINE.

APPLICATION FILED Aue.18,1919.

1,3.56,f30'7..` Patented ot.26,192o.

4 SHEETS-SHEET 4.

UNITED STATES PATENT oFFlcE.

WALTER D. CRAFT, OF NEWARK, NEW JERSEY, yAND FRANK F. SORENSEN, 0F

PHILADELPHIA, PENNSYLVANIA.

MILLING-MACHINE.

Specification of Letters Patent.

Patented Oct. 26, 1920.

Application led August 18, 1919. Serial No. 318,125.

To all 'whom t may concern:

Be it known that we, WALTER D. CRAFT and FRANK F. SoRENsEN, citizens of the United States, and residents, respectively, of Newark, in the county of Essex and State of New Jersey, and of Philadelphia, in the county of Philadelphiav and State of Pennsylvania,have jointly invented a certain new and useful Milling-Machine, of which the following is a specification.

The principal objects of the present invention are, first, to present the cutting operation to the convenient View of the operator; second, to facilitate the removal of chips; third, to provide for continuous milling; fourth, to provide for the convenient setting or adjustment ofthe machine; fifth, to make the machine automatic and accurate in operation, and sixth, to provide a compact. efficient and reliable milling machine well adapted to the rapid production of out or milled files.

The invention will be claimed at the end hereof, but will be first described in connection with the embodiment of it selected for illustration in the accompanying drawing. forming part hereof, and in which- Figure 1, is an end View, principally in transverse section, of a milling machine embodying features of the invention.

Fig. 2, is a rear View of the machine.

Fig.` 3, is a front view, partly in section.

Fig. 4, is a top or planv View of the carriage and its accessories detached, and

Fig. 5, is a horizontal sectional View of a portion of the carriage.

In the drawings 1, is a laterally sloping i horizontally extending bed. 2, is an inclined carriage provided with a work-holder 3 and longitudinally slidable on the sloping bed 1, being driven by a screw 4. 5, is a iXed head overhanging the sloping bed 1. 6, is a tool shaft substantially perpendicular to the sloping bed 1; 7, is a slide carried by the head, as shown in Fig. 3 by pin-and-slot connections 8. The bearing 7a of the tool shaft 6, is adjustable endwise on the slide by means of the hand-wheel 9, gearing 10 and screw 11, and the purpose of this is to afford a line adjustment of the tool. The shaft 6 is driven from the shaft 12, by gearing 13 and it is tubular for the purpose of lubricant, which may be introduced at 14.

15, is a. lever pivoted at 16 and one end of it worksl in a fork in the slide 7 and the other end is controlled by the pin working in a cam 17, pivoted at 18. This mechanism serves to lift the tool shaft 6 into and out of action. shaft which meshes with teeth on the cam 17 and which serves, when in eXtreme righthand position as shown in Fig. 1, to lift the slide 7 and tool shaft 6 and which serves, when in extreme left-hand position, to turn the cam 17 into position for locking the slide 7 against the adjustable stop 20, so that when the machine is running the tool shaft is locked or held against upward endwise motion. The rack shaft 19, is operated by suitable provisions 21 on the carriage 2, and also whenA desired by means of a handle 22, Fig. 2, that operates through thel link 23 and shaft 24. The power shaft 25 is driven from the shaft 12 by gearing 26 andthis power shaft 25 can be connected to drive the feed screw 4 by power and disconnected to permit the feed screw to be turned by hand, as will be described.

There is a worm-shaft 27 having a worm 27a, Fig. 5, and which may be driven by means of a handle 28 (Fig. l) and which can be coupled with and uncoupled from the power shaft 25 by means of a coupling 29 (Fig. 5) operated by a hand-shift 30. The worm-shaft 27 drives the clutch member 31 at relatively sloW speed through the worm 19, is an endwise movable rack gear 32 'and the worm-shaft 27 drives the .tappet mechanism 40, actuated by the travel of the carriage, Fig. 2, and the spring detent 41 controls the movement of the shaft 36. The rod a, is afforded lendwise motion in bearings b, mounted on the xed bed and this rod Ais connected pivotally by element 40, with part 38. c, is one of two duplicated collars on the rod a, and these collars are tapped by the part 21, Fig-.1, on the cal.'-

v riage. The other collar is concealed in Figa..

2, but will be readily understood. The fee screw drive shaft 39 carries one of the change gear-wheels 42, of which the other 43 (Fig. 1) is mounted on the end of the feed screw 4. The idler gear Wheel 44 is mounted on av stud radially adjustable in an arm 45 mounted to swing on shaft 39 and adjustable in circular direction by the curved slot-and-pin connection 46. In this way the gears 42 and 43 can be removed and replaced by others appropriate for producing the speed of the screw 4 required for various kinds of work. The machine is well adapted to continuously cut spiral teeth on file blanks, of which one A is shown as clamped in the work-holder. For this purpose, use is made of a crown cutter, shown at B, mounted on 'the ,shaft 6 but it must be borne Vin mind that the use of the machine is not limited to the milling of file teeth. However, when a crown cutter is used for this purpose the older, as indicated in Fig. 3 by the broken lines X-Y, and in this way clearance vis afforded for the cutter. Of course for some kinds of work this inclination is not necessar n'use a blank is mounted in the workholder while the -tool is retracted, as shown in Fig. 1, and then the tool is brou ht down to its Work and the slide is locke against the stop 20, as has been described, and the carriage is fed forward b the screw 4 at the appropriate speed. Upon the completion of the forward stroke, the tool is retracted into-the position shown in Fig. 1,

.and the carriage returns comparatively rapidly as hasbeen described. In the case of the continuous milling of files, the entire face of the le is milled during the described operation so that the production -of files is very rapid. The sloping position of the work and the inclination of the tool shaft,

- which is substantially perpendicular to the can be moved by hand as has been described, which is la matter of great convenience e and since the speed of the feed of the caruniversal application.

riage can be readily changed by the use of proper speed gears, the machine is of quite The fact that the tool is locked by a cam as 17 against a stop as 20 up to its. work is important because it insures accuracy.

We claim:

1. A milling machine comprising the com bination of a laterally sloping horizontally extending bed, an inclined carriage longand means for reciprocating the carrlage and turning the shaft` substantially as described. Y v

2. A milling machine having in combination a sloping reciprocating work-holder, ar inclined revoluble tool shaft perpendicular to the sloping face of the work-holder, feed and return mechanism for the work-holder, devices for advancing and retracting the shaft in response to the travel of the holder,`

and cam and stop means responsive to said devices for locking the shaft inadvanced position during the forward .stroke of the holder.

3. A milling machine comprising the combination of 'a laterally sloping horizontally extending bed,l an inclined carriagelongitudinally slidable on the sloping bed, a xed head overhanging thel sloping bed and having a bearing of which the axis is slightly inclined lengthwise of the bed to afford tool clearance,'a tool shaft substantially perpendicular to the sloping bed and turnably mounted in the bearings, and means for reciprocating the carriage and turning the shaft.

4. A milling machine comprising the combination of a laterally sloping ,horizontally extending bed, an inclined carriage longitudinally slidable on the sloping bed, a xed headl overhanging the ,sloping bed, a slide carried by the head and movable substantially perpendicular to the slopingl bed, a stop for the slide, a turnable shaft adjustably carried by the slide and inclined in respect tothe sloping bed, slide shifting mechanism responsive to the movement of the carriage and including a vcam surface adapted to lock the slide in respect to its stop, and means 4for operating the carriage and shaft.

WALTER D. CRAFT. yFRANK F. SORENSEN. 

